Exploring NZVD2016. NZ s National Vertical Datum. Rachelle Winefield. Senior Geodesist Location Information
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1 Exploring NZVD2016 NZ s National Vertical Datum Rachelle Winefield Senior Geodesist Location Information rwinefield@linz.govt.nz Hawkes Bay S+SNZ Meeting 3 October 2018
2 Overview 1. If it s not broke why fix it? 2. Napier 1962 is not MSL 3. What a is geoid? 4. The difference between NZVD2009 and The magic of NZVD2016 orders 6. How good are the relationship grids? 7. Why must NZVD2016 heights change? 8. Maintenance, resurvey and the future Not covering : height theory, or gravity data collection
3 If its not broke Image courtesy ZNO
4 If its not broke Desirable attributes of a national vertical datum: Accessible - anywhere Consistent reference system Compatible with technologies GNSS heighting Precise levelling Fit for purpose Robust Maintainable and assessable Map of New Zealand Maritime boundaries. GNS Science (2013)
5 Local Vertical Datums
6 Napier 1962 is not MSL
7 Napier 1962 is not MSL Long, liner, poorly constrained networks Restricted to roads Accuracy assessed on an observation basis Errors propagate No relative assessment of marks not observed Benchmarks move Difficult to tell if a benchmark is disturbed Absolute accuracy is unknown
8 New Zealand Vertical Datum 2016 Well defined zero level NZGeoid2016 Nationally consistent Maintained heights Accuracy statistically assessed Improved density of marks Consistent with NZGD2000
9 What is a geoid?
10 NZVD2009 vs NZVD2016
11 NZVD2009 vs NZVD2016
12 NZVD2016 transformations NZVD2016 heights (H) can be determined by subtracting a NZGeoid2016 height (N) from an ellipsoid/gnss height (h) H= h N The LVD Relationship Grids (OA) transform NZVD2016 heights (H) from LVD heights (HA) H A = H+O A
13 Case Study: Nelson City and Tasman District Tasman District and Nelson City Councils used to used independent height datums: Nelson 1955 and Nelson City Datum With a difference of ~12m. One building site within the Nelson City boundary, had services supplied via Tasman District Two sets of plans with two different heights had to be prepared. In July 2017, both councils successfully adopted NZVD2016 NZVD2016 is now the standard for
14 NZVD2016 Benefits Consistent heights Recoverable Readily accessible Easier to analyse multiple datasets Local Vertical Datums NZVD2016
15 Living on a Dynamic Country - vertical deformation New Zealand is constantly moving Vertical deformation is not always obvious NZVD2016 heights move with the land Press Release:
16 Resilience - Kaikōura Recovery The coastline lifted approximately 1.0 metre around Kaikōura, exposing kelp and paua.
17 Example Disaster recovery Current heights above the geoid can be observed using GNSS An accurate geoid would have reduced the need for extensive levelling Heights re-established by levelling 400 marks, 500 km NZGD2000 control re-established by GNSS Survey 250 marks
18 Local example:
19 NZVD2016 Order Magic Determined by observation - GNSS - Terrestrial observations - Order 1-2V levelling Relatively consistent Tested against accuracy standards
20 Relationship grids Datum Range STD Auckland Bluff Dunedin-Bluff Dunedin Gisborne Lyttelton Moturiki Napier Nelson One Tree Point Taranaki Wellington Stewart Island
21 Relationship grid control marks Heighted Marks GPS/Levelling Control
22 Relationship grid example Created using: datumgrid Parameters Grid Spacing: 2 Zero height: LVD mean (0.20) Point error: 1mm Distortion error: 0.5 ppm Mean (m) Range (m) SD (m)
23
24 Geodetic Database
25 Living on a Dynamic Country New Zealand is constantly moving Vertical deformation is not always obvious Press Release: Victoria University of Wellington 23 November 2016
26 LINZ Tools
27 Geoid maintenance
28 Next Steps Datasets usually defined in terms of different vertical datums and reference surfaces Topography MSL Hydro LAT/CD Cadastral MHWS Geodesy MSL & ellipsoid Challenge is to combine different datasets Photo: 14/09/12 Stuff: Snells Beach
29 Maintenance of control points Regional Deformation Monitoring Networks 8 years Local Deformation Monitoring Networks Being established
30 NZ Vertical Datum 2009 MSL Based Datums New Zealand s vertical datums
31 Questions?
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